BUG: Dentry still in use [unmount of exfat loop0]

Status: closed as dup on 2021/10/28 13:08
First crash: 944d, last: 944d
Cause bisection: failed (error log, bisect log)
Duplicate of
Title Repro Cause bisect Fix bisect Count Last Reported
BUG: Dentry still in use [unmount of ramfs ramfs] C error 3 949d 950d

Sample crash report:
exFAT-fs (loop0): error, exfat_alloc_cluster: invalid used clusters(t:15,u:4294967295)
exFAT-fs (loop0): Filesystem has been set read-only
incfs: Can't find or create .index dir in ./file0
BUG: Dentry ffff88811a47a660{i=0,n=.index}  still in use (1) [unmount of exfat loop0]
------------[ cut here ]------------
WARNING: CPU: 0 PID: 366 at fs/dcache.c:1616 umount_check+0x18d/0x1d0 syzkaller/managers/android-5-10/kernel/fs/dcache.c:1607
Modules linked in:
CPU: 0 PID: 366 Comm: syz-executor811 Not tainted 5.10.76-syzkaller-01178-g4944ec82ebb9 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:umount_check+0x18d/0x1d0 syzkaller/managers/android-5-10/kernel/fs/dcache.c:1607
Code: 8b 0b 49 81 c6 f8 03 00 00 48 c7 c7 00 40 2e 85 4c 89 e6 48 8b 55 d0 4c 89 e1 45 89 f8 31 c0 41 56 e8 5e d9 9e ff 48 83 c4 08 <0f> 0b e9 f1 fe ff ff 89 d9 80 e1 07 80 c1 03 38 c1 0f 8c c9 fe ff
RSP: 0018:ffffc90000bb7ab8 EFLAGS: 00010286
RAX: 0000000000000055 RBX: ffffffff866b4400 RCX: a00c70a513dce700
RDX: 0000000000000000 RSI: 0000000000000002 RDI: 0000000000000000
RBP: ffffc90000bb7ae8 R08: ffffffff81545288 R09: 0000000000000003
R10: fffff52000176ea9 R11: 0000000000000004 R12: ffff88811a47a660
R13: dffffc0000000000 R14: ffff8881069b83f8 R15: 0000000000000001
FS:  0000000000000000(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f5db3f691d0 CR3: 000000000640f000 CR4: 00000000003506b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 d_walk+0x309/0x540 syzkaller/managers/android-5-10/kernel/fs/dcache.c:1326
 do_one_tree syzkaller/managers/android-5-10/kernel/fs/dcache.c:1623 [inline]
 shrink_dcache_for_umount+0x8e/0x1b0 syzkaller/managers/android-5-10/kernel/fs/dcache.c:1639
 generic_shutdown_super+0x66/0x2c0 syzkaller/managers/android-5-10/kernel/fs/super.c:447
 kill_block_super+0x80/0xe0 syzkaller/managers/android-5-10/kernel/fs/super.c:1446
 deactivate_locked_super+0xb0/0x100 syzkaller/managers/android-5-10/kernel/fs/super.c:335
 deactivate_super+0xa5/0xd0 syzkaller/managers/android-5-10/kernel/fs/super.c:366
 cleanup_mnt+0x45f/0x510 syzkaller/managers/android-5-10/kernel/fs/namespace.c:1118
 __cleanup_mnt+0x19/0x20 syzkaller/managers/android-5-10/kernel/fs/namespace.c:1125
 task_work_run+0x147/0x1b0 syzkaller/managers/android-5-10/kernel/kernel/task_work.c:154
 exit_task_work syzkaller/managers/android-5-10/kernel/./include/linux/task_work.h:30 [inline]
 do_exit+0x70e/0x23a0 syzkaller/managers/android-5-10/kernel/kernel/exit.c:813
 do_group_exit+0x16a/0x2d0 syzkaller/managers/android-5-10/kernel/kernel/exit.c:910
 __do_sys_exit_group+0x17/0x20 syzkaller/managers/android-5-10/kernel/kernel/exit.c:921
 __se_sys_exit_group+0x14/0x20 syzkaller/managers/android-5-10/kernel/kernel/exit.c:919
 __x64_sys_exit_group+0x3b/0x40 syzkaller/managers/android-5-10/kernel/kernel/exit.c:919
 do_syscall_64+0x31/0x70 syzkaller/managers/android-5-10/kernel/arch/x86/entry/common.c:46
RIP: 0033:0x7f5db3ef4249
Code: Unable to access opcode bytes at RIP 0x7f5db3ef421f.
RSP: 002b:00007fff23a8ba98 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7
RAX: ffffffffffffffda RBX: 00007f5db3f68330 RCX: 00007f5db3ef4249
RDX: 000000000000003c RSI: 00000000000000e7 RDI: 0000000000000001
RBP: 0000000000000001 R08: ffffffffffffffc0 R09: 00007f5db3f62e40
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f5db3f68330
R13: 0000000000000001 R14: 0000000000000000 R15: 0000000000000001
---[ end trace 614232d097d0a2fd ]---
VFS: Busy inodes after unmount of loop0. Self-destruct in 5 seconds.  Have a nice day...

Crashes (3):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2021/10/28 10:23 android12-5.10-lts 4944ec82ebb9 be531bb4 .config console log report syz C ci2-android-5-10 BUG: Dentry still in use [unmount of exfat loop0]
2021/10/28 00:16 android12-5.10-lts 4944ec82ebb9 be531bb4 .config console log report syz C ci2-android-5-10 BUG: Dentry still in use [unmount of exfat loop0]
2021/10/27 23:51 android12-5.10-lts 4944ec82ebb9 be531bb4 .config console log report info ci2-android-5-10 BUG: Dentry still in use [unmount of exfat loop0]
* Struck through repros no longer work on HEAD.